Writing to NFC Forum Type 1, 2, 3 Tags

This tutorial describes how to write data to NFC Forum Type 1, Type 2 and Type 3 tags.

Steps

1. Follow the steps in Discovering NFC Tags to detect the type 1 tag.

2. Create a new instance of the specific tag class.

   • Tag Type 1: Create a new instance of CNfcType1Connection class. For example,

     CNfcType1Connection* Type1Connection;
     Type1Connection = CNfcType1Connection::NewL(iNfcServer);

   • Tag Type 2: Create a new instance of CNfcType2Connection class. For example,

     CNfcType2Connection* Type2Connection;
     Type2Connection = CNfcType2Connection::NewL(iNfcServer);

   • Tag Type 3: Create a new instance of CNfcType3Connection class. For example,

     CNfcType3Connection* Type3Connection;
     Type3Connection = CNfcType3Connection::NewL(iNfcServer);

3. Open the connection to the tag using MNfcTag::OpenConnection() and pass the instance of the tag class.

   For example for the Type 1 tag:

   MNfcTag* iTag; 
   iTag->OpenConnection(*Type1Connection);       

4. Write data to the tags using the specific tag methods .

   Note: Only one write command can be requested at a time for a specific type of tag.

   • Type 1 Tag: Write data to Type 1 tag using CNfcType1Connection::Write().

     void CMyTagInitializer::Type1WriteL()
     {
     	_LIT8(KSendText,"class1TagData"); 
       iWriteBuffer.ReAlloc(KSendText().Size()); 
       
     	//Specify the block address
       TInt block = 0; 
       
       //Specify the byte address
     	TInt byte = 6;    
       
     	TNfcType1Address address(byte, block); 
       iWriteBuffer = KSendText;       
     	 
       //Write data to the target NFC Forum Type 1 tag.
       iNfcType1Connection->Write( iWriteWait->iStatus, iWriteBuffer, address );    
       iWriteWait->SetActive(); 
     }

   • Type 2 Tag: Write data to Type 2 tag using CNfcType2Connection::Write().

     void CMyTagInitializer::Type2WriteL()
     {
     	_LIT8(KSendText,"class2TagData"); 
       iWriteBuffer.ReAlloc(KSendText().Size()); 
       
     	//Specify the block address
       TInt block = 0; 
       
       //Specify the byte address
     	TInt byte = 6;    
       
     	TNfcType2Address address(byte, block); 
       iWriteBuffer = KSendText;       
     	 
       //Write data to the target NFC Forum Type 2 tag.
       iNfcType2Connection->Write( iWriteWait->iStatus, iWriteBuffer, address );    
       iWriteWait->SetActive(); 
     }

   • Type 3 Tag: Write data to Type 3 tag using CNfcType3Connection::Update().

     void CMyTagInitializer::UpdateClass3Tag()
     {
     	_LIT8(KSendText,"class2TagData"); 
       iWriteBuffer.ReAlloc(KSendText().Size()); 
       
     	//Specify the block address
       TInt block = 0; 
       
       //Specify the byte address
     	TInt byte = 6;    
       
       //Specify the servicecode address.
     	TInt service = 11;	
     
       TNfcType2Address address(byte, block, service); 
       iWriteBuffer = KSendText;       
     	 
       //Write data to the target NFC Forum Type 2 tag.
       iNfcType3Connection->Update( iWriteWait->iStatus, iWriteBuffer, address );    
       iWriteWait->SetActive(); 
     }

   Note: The TNfcType1Address, TNfcType2Address and TNfcType3Address are helper classes which provides access to manage NFC Forum Type 1, Type 2 and Type 3 addresses respectively.

   The sequence diagram below illustrates how writing to a tag works: